CIE Jun 2016 v2 Paper 4 Q4

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(a) There are two isomeric complexes with the formula Pt(NH3)2Cl 2, one of which is an anti-cancer drug. (i) Draw diagrams to show the three-dimensional structures of the two isomers. PMT isomer 1 isomer 2 [2] (ii) Comment on the polarity of the two isomers of Pt(NH3)2Cl 2. Explain your answer.[1] Oxaloplatin is another successful anti-cancer drug in which the stereochemistry around the platinum atom is the same as that in Pt(NH3)2Cl 2. NH2 O Pt NH2 oxaloplatin (iii) Explain why there are no isomers of oxaloplatin.[1]UCLES 2016 9701/42/M/J/16<br /> (b) Only one structure of the complex [Ni(R3P)2Cl 2] is known. (R = CH3, R3P is a monodentate ligand) (i) What does this indicate about the stereochemistry around the nickel atom?[1] (ii) Draw a three-dimensional diagram showing the structure of this complex. PMT [1] [Total: 6]UCLES 2016 9701/42/M/J/16 [Turn over<br />

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